If you are from Holland and if you are looking for more information about DME and particles filters for indoor use, you should visit the website Roetfilter.org.
On this website you will find specific information about the regulations in Holland. Like in Germany (TRGS554), also in Holland you are obligated to use closed filters when running and operating a diesel engine indoors.
But not all particle filters are allowed. To work indoors you should use closed filters, With a minimum efficiency of 70%. Open and half-open filters have only a maximum efficiency of 30%-50%.
You will find information about temporary and permanent filters. Further you will also find a lot of interesting links.
Check out roetfilter.org for more information in Dutch about diesel engine emissions (DME) and diesel particulate filters.